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| A Sensorless Method Based on Average Torque Control for Brushless DC Motor |
| Sun Xiaoli1, Deng Zhiquan1, Wang Cheng2 |
1. College of Automation Engineering Nanjing University of Aeronautics and Astronautics Nanjing 211106 China;
2. Department of Electrical and Electronic Engineering University of Nottingham Nottingham NG7 2RD UK |
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Abstract Sensorless control and torque ripple suppression methods have been always a research hot topic for the brushless DC motor (BLDCM). This paper presents a new sensorless method based on the average torque control for the BLDCM with non-ideal back electromotive force (EMF). When the BLDCM with the back EMF close to the sine wave is controlled with the average torque method, the rotor position signal can be derived from the bus current envelope, which tends to decrease at first and then increase with a concave shape in each commutation cycle. The sensorless control and torque ripple suppression can be realized at the same time under the average torque control. Furthermore, no additional devices are needed. The proposed sensorless method is simple to realize and can expand the application range of the average torque control. Simulation and experiment results verify the proposed method.
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Received: 25 May 2017
Published: 12 July 2018
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2018, Vol. 33 
